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Extreme DataBase Lab

2008년 6월 3일 화요일. 더이상 이블로그를 운영하지 않습니다. 아래의 주소로 이전 되었습니다. Http:/ scidb.tistory.com/. 이 게시물에 대한 링크. 피드 구독하기: 게시물 (Atom). Oracle Data Access Pattern. Popular DataBase Scientist Link. DSS Performance in Oracle Database 10g R2. New Optimizer Features in 10g R2. Favorite DataBase Book Link. Optimizing Oracle Performance(Cary Millsap). Cost-Based Oracle Fundamentals(Jonathan Lewis). Mastering Oracle PL/SQL(Connor McDonald ). Mastering Oracle SQL, 2nd Edition. Physical Database Design(Toby J. Teorey).

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Extreme DataBase Lab | extremedb.blogspot.com Reviews

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2008년 6월 3일 화요일. 더이상 이블로그를 운영하지 않습니다. 아래의 주소로 이전 되었습니다. Http:/ scidb.tistory.com/. 이 게시물에 대한 링크. 피드 구독하기: 게시물 (Atom). Oracle Data Access Pattern. Popular DataBase Scientist Link. DSS Performance in Oracle Database 10g R2. New Optimizer Features in 10g R2. Favorite DataBase Book Link. Optimizing Oracle Performance(Cary Millsap). Cost-Based Oracle Fundamentals(Jonathan Lewis). Mastering Oracle PL/SQL(Connor McDonald ). Mastering Oracle SQL, 2nd Edition. Physical Database Design(Toby J. Teorey).

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Extreme DataBase Lab | extremedb.blogspot.com Reviews

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2008년 6월 3일 화요일. 더이상 이블로그를 운영하지 않습니다. 아래의 주소로 이전 되었습니다. Http:/ scidb.tistory.com/. 이 게시물에 대한 링크. 피드 구독하기: 게시물 (Atom). Oracle Data Access Pattern. Popular DataBase Scientist Link. DSS Performance in Oracle Database 10g R2. New Optimizer Features in 10g R2. Favorite DataBase Book Link. Optimizing Oracle Performance(Cary Millsap). Cost-Based Oracle Fundamentals(Jonathan Lewis). Mastering Oracle PL/SQL(Connor McDonald ). Mastering Oracle SQL, 2nd Edition. Physical Database Design(Toby J. Teorey).

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Extreme DataBase Lab: 1월 2008

http://www.extremedb.blogspot.com/2008_01_01_archive.html

2008년 1월 31일 목요일. Data Access Pattern - Rowid. 8226;Rowid가 조건으로 공급된 경우. 8226;인덱스를 사용하여 Table 을 access 한경우. 8226;Rowid를 이용해서 특정 Block의 특정 Row를 찾아간다. 8226;가장 빠른 Access 방식이다. 8226;max /min 일자를 찾아서 그일자에 해당하는 값을 select 할때(self join 시 사용). Where rowid = :v rid. SELECT STATEMENT GOAL: CHOOSE. TABLE ACCESS (BY [INDEX] ROWID) OF 'EMP'. 이 게시물에 대한 링크. 라벨: Oracle Data Access Pattern. Data Access Pattern - Index Full Scan. 8226;Optimizer가 Full Table Scan하고 Sort하는 것 보다는 Index Full Scan해 Sort작업을 따로. 이 게시물에 대한 링크. TABLE...

2

Extreme DataBase Lab: 2월 2008

http://www.extremedb.blogspot.com/2008_02_01_archive.html

2008년 2월 27일 수요일. SQL 이 좋은 언이이긴 하지만 집합처리 언어이기 때문에 불편한점이 많은 것이 사실이다. 특히 아래와 같은 구조에서 세로를 가로로 바꿀려고 하면 힘들다. SELECT DEPTNO, ENAME. 위의 데이터를 아래처럼 부서번호별로 가로로 바꾸어야 하는것이 미션이다. 10 CLARK,KING,MILLER. 20 SMITH,JONES,SCOTT,ADAMS,FORD. 30 ALLEN,WARD,MARTIN,BLAKE,TURNER,JAMES. 오라클의 경우 조금 복잡한 Recursive SQL 을 작성해야 한다. Ltrim( sys connect by path. Ename,','),',') ename. Row number() over (partition by deptno order by empno) rn,. Count(*) over (partition by deptno) cnt. Where level = cnt. Start with rn = 1. Group by deptno;.

3

Extreme DataBase Lab: 4월 2008

http://www.extremedb.blogspot.com/2008_04_01_archive.html

2008년 4월 25일 금요일. 치명적인 Hash Group By 버그. 10g 부터 group by 시에 느린성능의 Sort Group by 가 사라지고 빠른성능의 Hash Group By 가 등장 했다. 하지만 현재시점(10.2.0.3)에서 항상 Hash Group By 가 동작되는 것은 아니다. 성능면에서 배치 SQL 혹은 Migration 작업시에 몇억건의 데이터를 sort 하게되면 견딜수 없다. 주로 Sort Group by 는 insert - select - group by 상황에서 발생한다. Opt param 힌트로도 해결되지 않았으며 Only select 문또는. CTAS (Create table as Select)문에서는 발생하지 않는걸로 확인됬다. 아래는 간단한 테스트를 진행 하고 현상황에서 Sort Group by 를 피할수 있는 해법을 제공한다. 버젼 : 10gR2(10.2.0.3) ,. Optimizer mode :all rows. Group by DEPTNO) a,.

4

Extreme DataBase Lab: 블로그 이전공지

http://www.extremedb.blogspot.com/2008/06/blog-post.html

2008년 6월 3일 화요일. 더이상 이블로그를 운영하지 않습니다. 아래의 주소로 이전 되었습니다. Http:/ scidb.tistory.com/. 2010년 2월 7일 오후 1:47. Url=http:/ www.freewebs.com/order-amitriptyline-10-mg-online-melbourne]buy amitriptyline 50 mg online. Url]amitriptyline 10mg for sleep. London purchase endep 10 mg online. Purchase amitriptyline 50 mg online australia. London order endep 10 mg online. Order endep 75 mg online Melbourne. 2012년 12월 24일 오전 10:23. Url=http:/ clarithromycin.webs.com]order biaxin online. 2013년 1월 8일 오전 7:15.

5

Extreme DataBase Lab: 11월 2007

http://www.extremedb.blogspot.com/2007_11_01_archive.html

2007년 11월 17일 토요일. Data Access Pattern - Full Table Scan. 아무런 조건 없이 Table을 읽게 한 경우. 인덱스가 걸려있지 않은 컬럼에 대해서 조건을주고 Table을 읽게 한 경우. 인덱스가 걸려있는 컬럼에 조건을 부여했을지라도 Optimizer가 Full Table Scan이 유리하다고 판단한 경우. 테이블의 첫 Row가 들어있는 Block부터 HWM(High Water Mark)까지 읽는다. 한번에 DB FILE MULTIBLOCK READ COUNT에서 정한 크기 만큼 읽는다 . DB FILE MULTIBLOCK READ COUNT가 16이면 한번 i/o 할때 16 block 씩 scan 한다. (MultiBlock I/O). 10만건(평균적으로) 이상을 Read 할때 - 인덱스를 경유하면 더느림. 주로 OLAP/DSS 시스템에서 사용. OLTP 시스템의 야간 Batch 작업. Full(테이블명 또는 테이블별칭) */. 이 게시물에 대한 링크.

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Data Architecture(DA): RAID 1-6 레벨 이해하기

http://jjaemani.blogspot.com/2008/04/raid-1-6.html

2008년 4월 25일 금요일. RAID 1-6 레벨 이해하기. Http:/ blog.naver.com/jjaemani/50008507476. 피드 구독하기: 댓글 (Atom).

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Data Architecture(DA): [ db file sequential read vs db file scattered read ]

http://jjaemani.blogspot.com/2008/04/db-file-sequential-read-vs-db-file.html

2008년 4월 25일 금요일. Db file sequential read vs db file scattered read ]. Http:/ blog.naver.com/darkturtle/50014865473. Db file sequential read vs db file scattered read ]. 원문 : Why are Oracle’s Read Events “Named Backwards”? 출처 : www.hotsos.com. The event names db file sequential read and db file scattered read describe how blocks are stored in memory, not how they are read from disk. The two Oracle read event names are analogous to two classes of UNIX read calls,. Read is not guarateed to be contiguous.

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Data Architecture(DA): 10g Subquery Unnesting Anomalies

http://jjaemani.blogspot.com/2008/05/10g-subquery-unnesting-anomalies.html

2008년 5월 18일 일요일. 10g Subquery Unnesting Anomalies. Filed Under Oracle, Technical. My first thought was that 10g wasn’t actually costing the subquery and was automatically unnesting it. But in the spirit of BAAG (and since I didn’t want to jump to conclusions) I started digging a little deeper. Here’s the bird’s eye view:. SQL alter session set " optimizer cost model"=choose;. SQL set autotrace traceonly explain;. Where outer.sal =. Where inner.dept no = outer.dept no. 2 TABLE ACCESS FULL DEPT 6 30 3 (0)...

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Extreme DataBase Lab

2008년 6월 3일 화요일. 더이상 이블로그를 운영하지 않습니다. 아래의 주소로 이전 되었습니다. Http:/ scidb.tistory.com/. 이 게시물에 대한 링크. 피드 구독하기: 게시물 (Atom). Oracle Data Access Pattern. Popular DataBase Scientist Link. DSS Performance in Oracle Database 10g R2. New Optimizer Features in 10g R2. Favorite DataBase Book Link. Optimizing Oracle Performance(Cary Millsap). Cost-Based Oracle Fundamentals(Jonathan Lewis). Mastering Oracle PL/SQL(Connor McDonald ). Mastering Oracle SQL, 2nd Edition. Physical Database Design(Toby J. Teorey).

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